Boston Butt Question

I love making Boston Butts and making one for a party tomorrow. I have two coolers, one large and one small. I loaned out my larger one, so I won’t have it for tomorrow. My smaller one will hold the butt if I turn it sideways to rest. Would letting it rest at a different angle than it cooked make any difference? I would think not, but would like to hear others opinions.

Side note. I cook it uncovered until 160, then wrap it in heavy duty aluminum foil until it hits 203, so it would rest in the aluminum foil.