Congrats on the purchase!
Keep in mind you will probably not want to be using those NDPL's very often (they are not something you can just put on the drone and forget about it like a normal ND filter), so if you haven't already it might be a good idea to pick up some standard ND's. Polarization changes relative to the angle of the sun, and you can't adjust polaizers in the air, so unless you fly a straight, very specific flight path every time, you are going to end up with uneven footage. Just something to be aware of.