This specific application relates to small racing quadcopters, which have their own design constraints, but hopefully it's applicable on a larger scale.
Certain brands of BLDC ESCs are very popular with racers because of their small size and high power handling capabilities, which they achieve by simply removing filtering components on the incoming power leads. The most notable example is the LittleBee, which is actually known for blowing out video transmitters with its voltage spikes -- in excess of 50V.
As a physical layout, quadcopters usually have 1 ESC mounted directly on each arm, with all 4 sets of leads terminating on a common power distribution board in the center of the frame. The power leads are generally 16AWG silicone wire, 2-4" long, and carry between 20-30A averaged at 17.4V or less, for 3-6 minutes. The power distribution boards are generally simple 2oz boards with large power and ground planes and exposed pads for the leads to be soldered directly to. Smaller sets of "accessory" pads are broken out as well for components like the video transmitter, but these are directly part of these large pours.
The current idea I have is 20V unidirectional TVS diodes reverse-biased across the 4 sets of solder pads for the ESCs, and a 25v 1000uF low-ESR cap soldered where the battery leads enter the board. The idea is the large, single cap will help to smooth the rise/fall of the spikes, and the TVS diode will clamp anything above 25V before the video transmitter gear "sees" the spike. These spikes happen on the order of hundreds or thousands per second, for the entire 3-6 minute flight. I don't know if this will impact the TVS.
As both space and weight are at a premium in a racing quadcopter, are there any other additional components I can add, change, or modify to help reduce noise being fed from any ESC back into the overall system?