How Can I Create an Action Indicator?

Hello everyone!

I am fairly new to Unreal Engine and am currently working on a 2.5D farming sim type of game. I am wanting to implement functionality to plant flowers. I want the user to be able to plant them anywhere so I am not planning on using a grid system of any type. I want a square indicator to appear where the mouse is pointing so the user can see where their flower will be planted. I am struggling to figure out how to implement something like this. Would anyone happen to have any tips or resources I could access to do something like this? I have also attached a picture of Stardew Valley for reference showing the green box indicator for the user to see where they would be placing a seed.

Thank you so much in advance for any help that could be offered!

just spawn an actor to represent the square and set its position on tick, you could even check collision on it so see if its a valid placement