You are correct the direction antenna will affect the ability of the local PC to connect.

You are best off getting a device that has multiple antenna so you can have both types of antenna at the same time. I do not have a lot of experience with the 2 boxes you list but I have used hawkins hw2r1 box.

This box has different antenna for the remote connection and the local connection. If nothing else they have nice diagrams that discuss this issue.