Thank you both. Very helpful. I will stick with LU1 or LU1E.
Regarding the limitation of the KIT matrix, do you know this from your personal experience? I ask this because the data sheet is little ambiguous on this. Let me explain - while the table on page 2 clearly states that Ethernet over HDBaseT is not available for the KIT matrix but this might be because, the LU642L KIT ships with LU1 baluns which does not have a LAN port.
I am also inferring this because the first paragraph on the data sheet (attached) suggests that LU1E can be used for Ethernet with all the matrix in the "C4-LUXXX" family.
The Control4® 4K Ultra HD HDMI Matrix System comprises a Control4 4K Ultra HD AV Matrix Switch (C4-LU1082D, C4-LU862D, C4-LU642D, C4-LU1082, C4-LU862, C4-LU642, C4-LU642L), Control4 4K HDBaseT Receivers (C4-LU1E, C4-LU1) and Control4 4K Point-to-Point Kits (LTPTP-F, LTPTP-L). The Control4 4K Ultra HD HDMI Matrix System is designed to accept HDMI AV sources at its inputs and route them to remotely located HDBaseT receivers along with control and Ethernet (C4-LU1E only) signals.
4k-uhd-lu-series-data-sheet-rev-a.pdf