I live in Palm Springs and can verify remote parking does work In California. I have the same issue of a narrow garage with two cars to park in it. however, it's not as slick as using the summon feature on a Tesla, although it's seemed to have gotten better with the last app update. occasionally...
New Taycan owner here. We regularly go between Palm Springs and Tucson and used to have two Teslas so we are only familiar with the Superchargers in Quartzite and Gila Bend. Glad you had no problems in Arizona... we will be making our first trek out and will make our first charging stop in...