I use a Channel Vision can - I can't say for sure I'd do it again (Prefer to isolate security now), but at the time I bought it because it was the biggest can available (50") and I kinda like the plexiglass door - it's smoked and curves outward with provisions for a fan on top or bottom as well... when properly closed up, it's really nice looking.
The CV can's only have a single-gang cutout in the bottom so there'd be no way to just do a knockout to make that power center fit - but as mentioned above, anything can be done with a dremel.
In my case, I have an OnQ 20" can below the CV 50" so that's where my power strip goes. However I'm taking a hard look at eliminating the wall warts other than the Elk's AC adapter and going to a battery w/charge controller and distribution blocks... 120V UPSs are way less efficient than just directly tying in a 12V battery which could literally last for days.