No problem at all. I looked for the studs in the wall and attached directly to them with screws. The towel bar I bought was 18 inches long and the gap in the studs measured about 16 inches. This meant I needed to cut the towel bar with a hack saw to make the towel bar shorter so it line up with the studs.
I marked the studs in the wall before I bought the towel bars so I had a plan. I do wish the hand towel ring next to the sink was a little smaller and closer to the wall because it marginally blocks the sink.