Mounting Vibe Powerbox 65.4

[Bepis]

Currently in the middle of fitting a Vibe Powerbox 65.4. Sounds great on the test fit but now actually trying to put it somewhere I can't seem to find anywhere to put it.

My original plan was to put it on top of the factory radio so it came out with the glovebox if I ever needed to get to it again. However, it's contacting the back of the frame that the glovebox attaches to.

I took the amp off and put the glovebox back in to have a look and feel around to try and find a sufficient void but I'm struggling to find one. It seems the engineers didn't waste any space behind the dash.

The only other option I have in mind is to mount it rotated 90° onto the back of the factory radio but it isn't a great spot and won't be that secure.

I'd mount it inside the glovebox itself but there isn't really a great way to get the wiring harness in.

Any else fitted an inline amp in theirs?