I installed 2 arb compressors 4 weeks ago ( they are waterproof ) with a bash plate under the vehicle, did not drill any holes in the vehicle at all, my underbonet switch and outlet use the same fender type brackets, but on the other side, I almost thought they copied me, but of course it is the obvious way to do it.
The air intake and outlets are under the bonnet, i did the same arangement with my discovery 2 on Christmas 2007, but with 1 ARB compressor and it was still working in 2022 when I sold the vehicle.
I posted a few pictures in the steps added to rock sliders post.
You have to use 2 single compressors, and not their twin as the fan for cooling will fail with prolonged water and dust ingress.
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