Running several printers changes the problem from tuning one machine to running a small production floor. The fundamentals are space, power, materials, air and fire safety.
Racks and space
Heavy-duty steel shelving with rated load capacity holds printers at a comfortable working height. Leave room above each machine for lids and spools, and plan cable paths so nothing pulls on a moving printer.
Power
Heated beds draw the most current while warming up. Spread printers across circuits, avoid daisy-chained power strips, and have an electrician confirm capacity for larger farms.
Materials
Keep stock in sealed bins with desiccant, label spools by material and open date, and dry moisture-sensitive materials before production runs.
Air
Ventilate the room and filter enclosed machines, especially when printing ABS, ASA or nylon.
Fire safety
Mount a rated extinguisher within reach of the printers, install smoke detection, keep combustibles away from hot ends, and use remote monitoring so printers are never running without someone able to respond.
