TL;DR
When you have an agri tower selected, or hover over it, enable the agricultural overlay for all agritowers. Additionally, show how many farm plots are covered.What?
When hovering over an agri tower, or have one in your hand, show the same overlay covering all currently placed agritowers. Maybe also all terrain not covered too, albiet using the 1x1 grid instead of the 3x3 grid.Additionally, show how many farm plots the yet-to-be placed (in hand), blueprint, or hovered agritower will cultivate.