I had an extender and didnt have much success with it. Went to a mesh setup and solved most of my dropout problems but hard to tell if it made an SQ difference cause I made several other changes that improved my SQ. But I believe it has a roll. My modem is on one end of the house and my rig the other, half dozen sheets of drywall to go through.
I have 3 nodes. The base node connected to router is in direct line of site of node #2 and the 3rd node is hard wired to streamer and is in direct site of #2. Node connected to rig is not in the cabinet with other gear. Its out in the open on the floor.
My neighbor had an extender but was still suffering droputs on his upstairs laptop. Went to a mesh and placed one node on 1st floor directly under the upstairs room where the laptop was used and in direct line of site of the base unit. Problem solved.