Is it possible to get the rebate if you just buy the HPWC from Tesla now and worry about installation later (to beat the deadline)?
I thought about doing the same, but sadly no, the full program requires it to be installed. Proof is required as you need to submit in pictures.
I looked into this earlier this year, but wanted to wait until closer to the delivery of the car before proceeding. Didn't realize they will get rid of the program that quickly otherwise I would've just done it back then.