The engine manual usually gives guidelines regarding installing the engine. You have not mentioned which engine though.

One thing you have to be careful with inverted engines is that when sitting fueled and waiting your turn, any fuel in the crank-case will slowly flow down into the clyinder. Then, when you apply the booster and try to flick it over, it will backfire. Be mindful of this if you dont want cut fingers1 This is also the reason why they flood. If this happens, simply create a siphon by raising the fuel line to just above tank level and then down again to the engine. This will prevent excessive flow. You can hand start most vertically mounted engines but in either case play it safe and use a chicken stick atleast. Dont ask me how I know

Ameyam