Crib mobiles - necessary or not?

Ke
My hubby and I are on the fence about getting mobiles for our twins.  One, we have mini cribs so not all mobiles may fit on them. Two, since there's two of them, I wouldn't want to play music since they wouldn't be synchronized.  
We also don't want them to lose out on the benefits of mobiles like motor skills and stimulation.  
I was thinking of making my own.  Anyone try this?
Thanks for the feedback!!

Vote below to see results!

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors