Hello all. This weekend I'm installing a wall mounted runtal radiator with the supply/return lines coming through the wall. The current configuration has the pipes through the floor. Everything is copper so repiping this isn't a problem. The pipes will run up inside the wall to drop ear elbows (copper x fip). My question is, since the drop ears will be screwed tight to framing, will this be too rigid for a radiator installation? Should radiator pipes have some play for movement? Thanks