Salamander A5/B Archetype
I got mine on Amazon: https://www.amazon.com/gp/product/B0006VPUMQ
Though if you are handy with some power tools, the shelf is basically just a bunch of MDF with some holes drilled in the corners and then 4 threaded rods and some bolts/washers/
I wish I could take credit, but it's a Salamander Designs shelf. https://www.amazon.com/dp/B0006VPUMQ/ref=cm_sw_r_cp_apa_fabc_CDJ52P4NWXXY3RRTM0B8?_encoding=UTF8&psc=1
Why not just buy a Salamander Designs stand? I have an Archetype 5.0 like this and it works great. I have my ATI amplifier on the bottom and it's much bigger than your XPA-2. Sticks out just a tad on the back, but the feet are all on the stand. I have that, my Threshold above it, Integra processor above that, and APC power conditioner above that - the top has random junk I put on it because why not.
I had enough room with that stand to leave plenty of room for cooling above each component, plus the open design is great for letting air get to them. My room is still an oven, but the stand isn't making them hotter than they should be. Finish is kinda crap on the black one, I bought it because it was cheap, matched my stuff, and I didn't care - but the nicer finishes probably hold up better. You could honestly just buy some wood and then order the rods and stuff from Salamander and make your own, I realized after I bought it - but more work involved.
It's a much better stand than my other stand (Actually it doesn't look just like this, but same general design.) It's made for shitty components that weigh nothing and aren't deep. My large Denon AVR will not fit in any shelf because it's too deep, so it sits on the very top - just like OP here. I'm just too cheap to buy two Salamander stands. It is annoying pushing buttons on stuff though, the whole stand wobbles. I use the remote mostly anyway and it's in the corner - so not like it will get knocked over.