If you cannot but extend, extend the motorwires instead of batterywires and keep controller(s) close to battery(s). No need for extra input capacitors

Too long wires batteryside will kill ESC over time: precautions, solutions & workarounds - RCG
Contents

• Two problems
  • Voltage spikes higher than battery voltage: transistor/FET/chip breakdown.
  • Current through input capacitors too high.
• Example: four costly controllers consecutively cremated
• Solution I: simply lengthen the motor wires instead
• Solution II: add extra capacitors, rules of thumb
  Calculation spreadsheet
• Capacitor type and polarity/orientation!
• How & where (not) to add extra capacitors
  All capacitors as close to or on controller, do not distribute along batterywires.
• DIY capacitor pack pictures
• Capacitor & pack suppliers
• Expert/manufacturer opinions & their rules of thumb
  They all say the same ... noise_reduction_101, switching_power_supply_design_101.
• Cause, explanation, water hammer/knock analogy&video, theory
  References
• Measurements & scope traces

Some well-structured reading for rainy/windy days, and some handy e-tools as well. Will save you, and us a lot of questions. Notably the 'what went wrong?' kind of questions Will also prevent you from burning up several controllers and/or motors and/or battery:
E-flight primer and tools

And pleasepleaseplease, do your RC equipment, wallet, ego, battery, controller, motor, house/garage/car a big favour ... get a watt-meter. It will more than pay for itself, will save you at least one fried motor and one fried controller. Will also help you finding the best setup.
Keep battery-/-watt-/multi-meter wires short!
too long wires batteryside will kill ESC over time: precautions, solutions & workarounds

Vriendelijke groeten en wees voorzichtig, Ron
• Without a watt-meter you're in the dark ... until something starts to glow •
• E-flight calculators • watt-meters • diy motor tips&tricks • Cumulus MFC •