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You can do it on such a low rail, but it will be a pain in the ass to land it clean.
And id also suggest you learn blind 2s because its much easier to do a blind 4 than frontside 4.
(Had to write this in a hurry)
HuskyComateThat just depends on your natural way of spinning. If you rail right foot forward and spin left it might feel easier going for back 4 since going for "unnatural" front 4 might feel awkward.
4's out of summer setups are definitely doable. Might be a little hard when first trying since 2's out take little effort compared to 4's.