When we ordered our 5.0 in August of 2018 we wanted our GoPower controller mounted above the fridge. They said, "No" and explained the GoPower would be cut-in underneath the dinette bench and the tank monitor/water pump/water heater switch would be above the range hood. They felt there was heating problems above the fridge, and any controller should be as close to the batteries as possible.
I asked about installing another cabinet in that dead space and was told it would impede the cooling of the fridge.
Rather than cut into the dinette bench we asked for the GoPower controller to be zip-tied underneath the bench. After two years floating on top of two plastic boxes I replaced the GoPower controller with a Victron 100/30 controller that I read using bluetooth on my phone. Thank goodness we didn't have the GoPower cut into the bench front, since now there would be a gaping hole, or the GoPower would be sitting there useless. However, it could be used for a portable (a year earlier I had purchased a Victron 100/20 controller for our Renogy portable though).
Enjoy,
Perry