ADAC GT Masters Finale Hockenheim

[Pizzamannen]

Got my weekend tickets for Hockenheim finale of Adac gt masters.

Im going alone and I've never been to Hockenheim before. Im going Saturday and Sunday, will be coming from Mannheim in the morning.

Quesitions about Hockenheim.
Were will parking most likely be?
Havent really found any good info, only for F1 weekends. And there won't be as many people... i guess.
Best spots for photography?
Got a 400mm lens. Public spots, doesnt need to be grandstands.
Tried to see on google maps if there is a tunnel under the race track from the pits to the other side of the start/finish straight. I only saw a tunnel under the drag strip and after the first corner.

Questions about ADAC GT Masters.
Ive read online that they sell gridwalk tickets only super early for the day and only a few tickets. Is this true and what do they go for?
I saw for most adac gt masters events there is a 30min pitwalk, is this for public?
Ive been to a few Blancpain races, are the cars in adac gt masters and blancpain running the same regulations? or is there a difference?

If you got any other tips, please tell me!