Best Engineer Monkey Path
The first upgrade is larger service area, it gives the engineer monkey the crucial extra range he needs. If you are running top path with it i would highly suggest. Webin bloons td 6, it is important to choose the best crosspathing for a specific tower in order to receive the best benefits out of that tower type. Towers have special roles to play for. Webmiddle path is very useful if you know how to use it and it's definitely my favourite but if you want just put tower down and win than to path is my recommendation.
Top path farming and catching leaks: Webtop path engineer is a’lot of things, mostly popping power, but lets start with the basic upgrades. The sentry gun isn’t very good by itself, but with other towers.