retro-reflector (reflector) alternative?

hello! I have always been driving around without a reflector, but I want to build up a 3 points for such a lappalie would be rather senseless. at my heck is actually no place for it, for two (if I also mostly drive alone) grinds almost the character. therefore the question is whether there are also narrower and wider reflectors or if you can drive even 2 half, for example which ones with e-signs of nem other kfz (roller, car, …)? funny question but maybe you fall what a… gerrit