People have mounted them on the A-piller, driver side speaker area, steering column, gauge cluster, gauge cluster bezel, center vents, in place of the HVAC control knobs, the clock area, radio bezel, into the dash just above the glove box, and some misc electronics (SAFC) on the sun visor.
edit: I forgot about the Electronic Suspension Pod that would go where the dash plaque sits, 89 underdash drawer, glovebox.