You are putting yourself at a pretty massive disadvantage if you are using Webull or Robin Hood for scalping, they lack precision and their interfaces being on mobile is very restrictive.

With scalping you need tons of speed and a trading DOM, aka Price Ladder. Also you need a way to automate and save strategies, so that a stop-loss, trailing-stop, take profit point is preloaded as you hit the button to enter.

Scalping is a delicate balance where just a few ticks can make or break you, profits will likely be razor thin at times so you won’t have time to place stops or exit points after you enter the trade, especially if you are trading volatile markets, such as the /ES.