I ran them over 30 metre currently somewhere around 50 - 60 metres though this was for a sun limiting inverter but it uses the same CT as oem devices do
I run the distance using CAT5/6 wire and connect multiple pairs the the CT as two wire and for each to each side side twisted pair ( this will will reduce interference) then i connected multiple twisted pairs together this increases the size of the transmission wire which reduces line loss. also as robert said i avoid crossing any electrical lines but if that would be difficult you could use a shield cat 5/6 and ground the wire to absorb and dissipate any interference
you probably could run multiple CTs with one wire just use solid core Cat6 as it it has plastic wire divider to reduce noise interference between the pairs