The grid size is here:
Eyeballing the grid tells me it’s 400uus, place the player start in the middle, set the Move distance to 400, and you should be ready to go. If you’re anticipating inaccuracies (that may or may not build up over time), you can snap the resulting vector:
One note, you named it:
This is quite misleading (hence my original question), because the engine has a dedicated Player Controller class.