General A/C Installation Questions

Recently I bought a universal kit to install in my Valiant. There are a few items that the installation instructions don't address and the place I got the kit from hasn't gotten back to me yet. Does it matter if the service ports are at the highest point in the system? Would it be OK to put the service port near the condenser instead of the compressor? Does the dryer need to be mounted upright or is it OK to lay it on its side? Any information would be appreciated.