I think something like the formation below might be the best way to incorporate Dybala into the side, provided that we do end up signing him. If we use him as a False 9, we can then probably play both Martial and Rashford, with Martial starting centrally and moving left (à la Henry) and Rashford starting slightly out wide to the right but making runs in between the LB and the LCB. Pogba tends to favour attacking down the left side I think, and we can use him to link up with Martial. Unfortunately, our right side figures to be significantly weaker than our left side given how Rashford will spend most of his time making central movements in attack; if AWB doesn't show much attacking prowess, it's hard to envisage how the team will create chances from out on the right. Another possible problem is who to pair with McTominay in midfield, given that Matic looks past his best, although this is more of a personnel problem than a tactical problem. Likewise, I am uncertain of who to pair with Lindelof, given that our other CB options don't exactly fill me with the greatest of confidence. Regardless, given Pogba's defensive lapses and the fact that Dybala isn't exactly a renowned defender from the front, this formation will only really succeed provided that we do find defensively-sound partners for both McTominay and Lindelof.
So much for symmetry being the basis for a good team! That's all over the place!