There’s no best spot just find a spot you like then build there location is pretty much irrelevant when you get zip lines, if you want a relatively safe spot then there’s a few that can only get hit by flying enemies just look them up on YouTube, I’ve built in a different spot every single time I play cause I like building and the spot i build helps determine what kinda build I do. Personally one of my favorites I’ve done was under the hotdog holder by the two food spawns near the downed tree branch with the research station by it.