I got 15-feet of XLR for 1 system between the preamp and amp. Though I am not sure if the Schitt Mjolnir v3 preamp and Schitt Wotan amp are AES48 compliant (I will ask today). My Benchmark HPA4 preamp and CODA #16 amp are AES48 compliant and have 25-feet of XLR between them.
I hate having anything other than an amp between the speakers.
I use the low-cost Benchmark XLR cables for the long lengths. Great cables for these long runs.