IF you do use a booster, make absolutely certain the width of the booster is about 1/2" - 1" smaller than the width between the leak guards of your adult diaper. Center the booster in between the guards, and this will leave just enough of a gap so the leak guards can work properly.
Also, make sure the booser isn't too thick when wet. If the booster swells up enough it can lift the diaper up off your skin enough to also lift up the leak guard away from your skin as well.
Either of these two problems will actually work against you, and will increase the chance of leaks more than not using a booster at all. Worse still, thanks to the booster there will be more pee there to leak, causing an ever bigger wet stain when it does leak.
Personally, I find a size 1 baby diaper works best. As a bonus, they actually work better than most boosters out there, and at a fraction of the cost. Still though, you will eventually realize the added cost of any boster is better put to use in just getting better diapers. You'll spend the same amount of money, but get much better performance without the hastle or problems of a booster in the first place.