Offset rear main seal

On my Ford engines with 2 piece main seals, I was taught that you dont install the seal flush with the block or cap. Instead, you install them so that 1/2" or so sticks out so the parting line doesnt match up with the parting line in the cap/block. From what I have read on the Mopar side, you guys dont do that trick. Have I not read enough to know or is there a reason you dont do that with 2 piece main seals?