So, I've found a way to be able to install two EK SE 360's into my case (Evolv ATX TG) without any real mods. I did kind of cheat a little bit, bit no mods. On the top I currently have a 360*26mm radiators, and, I do believe my 360*26mm in the front installation idea will work also.
I had to push the top mounted radiator as far back as possible. To do this, I removed the top panel of the case, and loosely installed the radiator on the removeable bracket, so it could slide forward or back. I put the bracket into it's top mount position, then slid it all the way to the case rear. Which is where I'll tighten it, then put the top cover back on. To mount the front radiator, and still have the inlets and outlets at on the top of the radiator (so air can escape the radiator easily), I actually switched locations with where the front intake fans mount and where the radiator mounts. This gave me the clearance needed to be able to put fittings on the front mounted radiator. Here's a quick couple of pictures.Sorry for the low quality, my camera on my phone is a bit damaged.
So, if I went with a 26mm thick radiator in the front, and mounted the top 360mm radiator as normal, this is the maximum clearance I can achieve, with the inlets on the rad towards the bottom of the case. This also will not work with two EK 360's, but only a 240mm rad, as the 360mm is too tall, and you can't slide in one of the radiators.
But what I did here was switch where the front fans and radiator would be mounted. Since the radiator is the same thickness as a fan (or 1mm more to be technical) here it is fitting in nicely. I used a 2x45degree fitting to squeeze between the two radiators, also, as seen here. A single 45-degree fitting (or maybe even 90 degree fitting) would likely work as well. It's not the most elegant solution, but it's a solution. I'm still trying to find a way to have the radiator in it's normal place, and the fans in their normal place too. But, there won't be enough clearance if I do anything else it seems. Also, with this particular radiator, I didn't need to use any special fittings for the other inlet on it, because it's offset from the top radiator and has plenty of clearance for just a simple compression fitting on it's own.
Next, I was able to check just how bad the flexing on my ASUS ROG RVE10 motherboard was. This motherboard is 272mm wide, and, the case only officially supports motherboards up to 272mm wide. I originally had left the rubber grommets on the side piece first, but they had to be removed for me to be able to really sit the board down nice and straight. I also had to remove the motherboard's backplate and LED piece. This kind of upsets me a bit, because it's only 8mm. If they had just made they case (and motherboard tray) another 10mm deeper from front to back, it would not have made the case significantly larger, but it would have GREATLY improved dual 360mm rad compatibility AND allowed for regular E-ATX motherboards to work without an issue. That's my one biggest complaint about the case, is that they didn't just make it 3/8-1/2" deeper front to back.
Some pictures "measuring" the flex. I'd definitely recommend using electrical tape to insulate that side of the board going along the angular piece, just as a precaution. Get the good stuff, that will stick for a long time, not the cheap crappy stuff. And remove the grommets, and you'll fit what basically looks flawlessly. I don't believe anything on the board touches, but again, electrical tape just to be sure.
This image makes it look a lot worse than it really is in real life. It basically doesn't flex here, as far as I can tell.
And this image, the grommets were installed. The grommets will make the motherboard flex, but, even with the grommets installed and the board flexing some, there was still space between the SATA data ports and the side of my graphics card, so they weren't touching.