I mounted a 2900r on my center console. If I ever get a dual bander with a remote head I'll mount the radio under the passenger seat, and the remote head infront of the shifter or where the current radio is.
NMO antenna mount in the center of the roof, coax runs down the passenger side a-pillar, under dash and center console to radio.
Powerwerx ring terminals with 20A fuses and 10 gauge wire with Anderson powerpoles crimped on, run along the firewall, through a hole in the drivers side of the firewall, under dash and center console where it has Anderson powerpoles before the radio, then the factory plug into the radio. All 10ga Powerwerx wire used.