I use an 8 port splitter from GPS Networking. There is a 4 port variant:

https://www.gpsnetworking.com/products/aldcbs1x4 
<https://www.gpsnetworking.com/products/aldcbs1x4>

With the hi isolation option (highly recommended :) and external power, it is 
$650.

The 8 port version is $1100. Not inexpensive, but you’ll probably never need to 
buy another one.

Denny


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