Is it possible to access with a tripod? And if not, instructions to leave the backpacks? Thanks

I think that if it is small they let it pass without any problem, in case you have something that they do not allow they keep it for you and with a code then you claim it !! Good luck ..

If it is feasible not to be great (professional). They can also be saved

If it is too big, No Way!

They let you use the tripod but the selfie sticks don't. It is the same in almost all viewpoints and museums.