Protools & Cubase sync

Hi there !
I’d like to figure out how I can sync 2 macs running PTools and Cubase 9 with better accuracy than with MTC.
In my workflow, MTC sync is not precise enough, specially when percussions are (re) recorded.
I suppose I can use LTC (in audio) in Cubase and rout it to an Avid Sync interface so ProTools can precisely chase the TC
But I also need to use Cubase as slave and PT as Master…
I’ve just discover the Nuendo SyncStation. But it’s quite expensive (and is it useable with Cubase).
Thanks a lot for your answers.