Yeah, I understand. Do be sure to clean the res and the case pretty good with alcohol before applying the industrial strength velcro to make sure it adheres solidly, and that stuff will hold it. I've seen a few short ~6-8" strips used to mount a 32" tv to the wall and after a yr or so hanging there it didn't want to let go. We thought we were either going to break the TV, or rip a hole in the wall, or both. We eventually managed to get it loose by using a long flat prybar like roofers use to remove shingles.
fwiw, I'll be using the velcro too, but, as I explained quite a few posts back already, not-so-much because I would really mind drilling holes, but because I'm mounting a Photon 270 D5 pump combo and I'm hoping the velcro will afford me some decoupling and be quieter than if I mounted it solidly to the bracket. That's the working theory anywho.