With smaller models, the level of vibration changes in amplitude and goes up in frequency. It can still be a challenge to properly-isolate the receiver. In an electric-powered model, the vibration is much, much less severe than in engine-powered aircraft, but will still be present. In the larger models, with big electric motors (gas to electric conversions), they get a high-amplitude, high-frequency vibration, which can be as destructive, if not more so, than the lower-frequency vibration of an engine.

For the very, very small electric models (park flyers, slow flyers, indoor flyers) a bit of foam tape or gel may be enough. Weight is certainly a consideration, but so is the longevity of your equipment. You have to compromise. For maximum weight savings, you remove protection from the system. For maximum protection, you add weight.