Complete amateur/hobbyist. Purchased a Weebill S on a whim as I have been having fun shooting my car along with my friends.

Is there an affordable option for mounting my phone to use as a monitor? I'll be using underslung quite often and since I have an a6400 the screen doesnt flip out. Does any phone mount that has a 1/4" thread work? The Zhiyun option seems expensive for what it is, albeit well made.

I have lots to learn as far as shooting with a gimbal, and I really did purchase this on a whim. If anyone knows of any tutorial type videos that are good for beginners off the top of their head I'd be interested in seeing them!

Thanks

Edited to make it clear I just want to use my phone as monitor, I'm shooting with an a6400