mount 12>220V power inverter where?

[Waldo]

I'd like to mount a 12>220V Waeco PerfectPower PP402 inverter and connect it permanently to the leasure battery under the driver seat as it has a built in fuse. Any suggestions? I already have a battery charger at the back of the driver seat (http://www.maxxcamp.de/en/shop/products/182_automatic-battery-charger.php) and a kitchen module behind the passenger seat. I was hoping to mount it under the dashboard, any good ideas? The on/off button is on the opposite side of the mains contact, so putting it under the driver seat is not a good idea unless I buy the external switch.