Recommendations ?

I just found out my daughter I’m currently pregnant with has a fetal heart arrhythmia everything else is structurally good with baby’s heart and I know the arrhythmia should go away before birth but I wanted to get a baby monitor like the owlet to monitor her after she’s home for peace of mind I’ve seen some give rashes and some that didn’t work very well and they are expensive so I wanna get one that will work just right any recommendations?? What worked for u and do u think I need it ?