Not a pro but i’d run it paralell to the house if you want the immeidate backyard to be mostly pool - fwiw i’d want it a bit tucked away personally and would have a landscape designer give me some options of how else it could be placed in the yard - part of that conversation would be what else besides swiming/pool centered entertaining am I interested in for the backyard space

Do you have a site plan of your property with your house on it? That would help answer your question. Your property may have setbacks that will govern in part where a pool can be placed.

Too little info .PLease show us your house and size of lot too

Yes.

For noise control, perpendicular.

depends on what else you'll include in the yard along with the pool... a pool house/cabana, patio, garden, planting any trees to hinder the sunlight on the pool?