A lot of us have mounted the Amp under the driver's seat. I would reccomend this because the seat is easier to remove and install. If you desire to adjust the output of the Amp, removing the drivers seat only takes about 2 minutes versus fighting with the back right bolt on the passengers seat. There is enough clearance under the the drivers seat to raise the Amp up with spacers. I have 1 amp under each seat at the current time.
Thanks @Slingrazor
I was considering the passnger side but now will change that to the driver's side, after your advice.
The amp arrived this morning so when the other items get over to me from the US, then it will be time to get started. (Hopefully our weather will have improved by then).