i agree with those suggestions.
however, i wonder how noisy that pump is, and if too loud, i would suggest the trunk just because the noise would be farther away from hearing it inside.
if too noisy, you could build a well insulated box to cover it to cut down the noise.
but then how much heat does it give off, and i would imagine it might just need some air space to keep it cool enough so it wouldn't burn up.
just throwing some things out there, as i'm not familiar with that pump.
had an imperial one time that had factory air shocks, and if i remember correctly, the pump for that was mounted under the right rear trunk floor. it didn't work correctly, so i removed it and installed separate air lines for the shocks so i could fill to whatever pressure i wanted.