What devices do you want to power?
Obviously if you mostly plan to charge tool batteries, run a radio or laptop, top up a cell phone, etc, it'd be more efficient to use a 12VDC powered device instead of running 120VAC from an inverter.
Keep in mind that
the Brutus alternator is about 1.2KW and breaks even somewhere between idle and 2000RPM. It's possible for added accessories to drain the battery at idle, so keep an eye on your battery voltage when running accessories even with the engine on, especially if you draw more than about 500W continuous load.
What would the group recomend as the best way to mount an invert-er and where on the unit to place the assess to it?
There are accessory terminals behind the dashboard. Depending on your factory-installed options, there may be unused fuse positions under the center console or under the hood.