iPad Pro 2016 compatibility

Sorry, this is a bit of a nothing post, hoping for a quick answer.

I’m not really techy, especially around apple products.

I’m looking to get going on TR again after a 12 month hiatus, and planning to use an iPad Pro from 2016 - it’s not blindingly obvious to me what counts as 2nd/ 3rd gen etc and what, if any dongle I’ll need.

So with the 2016 iPad Pro do I need a Wahoo ant+ key, the Apple Lightning Adaptor or will I be able to connect via bluetooth?

I have used IPad Pro (A1709) from 2017 with TR and connected my Wahoo trainer, powermeter and HR sensor via bluetooth.