Yeah, about 3 too many ATM LOL as 3 are undercover and 3 left outside, have run out of space and hate seeing them parked outside, I've got another 2 garaged at my parents place...
With yours willhouse, if your going to put stands under it, make sure you position them on sturdy chassis locations and not the floor pan or other thin/soft bits as they'll crumble under long term load...also place a rubber or other softer material between stand and vehicle.
If you have enough of them (4) you could just use the factory jack/s at all 4 corners - problem solved
The other thing you could do if you didn't want to dis-connect the battery and ' if ' you had another one handy is use jumpers on the spare one and connect them in 'parallel' ie. + to + and - to - or - from the spare to chassis ground on the car and that will give you twice the standby endurance time...
The other thing I suggest for when you get back is: for the initial start up, just let it idle only without accelerating it for about 5-10mins. then switch it off for another 15-20mins. to allow 'heat soak' to loosen it all up properly, then re-start and fettle the throttle a bit from there...
Either way with a little care as your doing it'll be all good when you come back