Most HWlabs rads, with the exception of the SR-1 are High FPI and need high cfm fans. This rad in particular is unique, since it has the barbs on opposite ends.
Fwiw, HW Labs makes pretty decent radiators, although I have no experience with the X-Flow series.
I think that these radiators have a pretty dense fin arrangement (FPI ~ Fins Per Inch), so you will need some fans with decent static pressure and cfm.
I have a couple of HW Labs radiators mated with 38mm-deep Panaflo fans, they do the job of cooling quietly and efficiently.
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