Flat head and side sleeping

My baby (14 weeks) is starting to get a flat head. A few moms told me to put him on his side for naps with pillows/rolled up towels all around him - supervised of course. Have any of you mamas tried this? Did it work?

I’m doing other things to get rid of the flat head as well - tummy time, holding him, etc. I used to use the baby moov love nest pillow when he slept but my baby doesn’t like it anymore. So now I only use it when he is on his play mat.

Any other tips?