I draw your attentions to the remarkable MU69 occultation project led by Mark Buie (SwRI) and collaborators in mid 2017. The TNO is now formally named by the IAU as (486958) Arrokoth, https://en.wikipedia.org/wiki/486958_Arrokoth
A new paper describing these observations, equipment and analyse makes fascinating reading: Size and Shape Constraints of (486958) Arrokoth from Stellar Occultations https://arxiv.org/abs/2001.00125
The observing teams include some amateur observers making professional contributions. The paper goes into some detail on the methods of prediction and deployment of the observers to maximise the chances of success.