Cabinets, heat and gear stacking

If you can use a flush cut router bit you could leave the back on drill one hole big enough for the bit and then rout out a section of the back. Loads of masking tape front and back first to prevent tear out. If you want a slightly neater job you could stick some temporary 10mm strips for the bearing to rest on as the bit cuts.
 
Better safe than sorry: Right?
Pix soon

$189 for that IKEA besta rack is quite pricey, considering the load capability. indeed the finishing is pleasing the eyes. are you open for DIY option with heavy duty load capability?

i had build TNT style rack 2 times previously (ended as my power tools rack and kitchen rack) and found it boring for my eyes. then I browse so may diy rack inspiration from pinterest and build my own design. using old mahogany 8cm as the base and 5cm on the shelf, custom U steel frame 40mm width & 16mm thickness (cut from steel plate and welded)

hot class a amplifier on each side, other gear on the center. with 4 of 7cm screws should be able to handle heavy load
 

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Well the three amplifiers fit. Tomorrow I'll start on the RHS making sure the HT amp; the Pre-amp and the crossover will have enough room and ventilation too.
Quick question on speaker cable, with the Rotel what's better? Banana plugs or spades?