We needed clock inputs 2xSMA 1 PPS and 10 MHz 3.3V biased square wave over 50 ohm for our application. We did not find anything off the shelf so we designed a simple board with KiCAD.
We thought others might also need this. Check it out https://lightside-instruments.com/index.php/product/clockinput4ultra96/
This board is now part of the Network Programmability kit for Ultra96 project.