when i start automating my planks and poles i have seen that there is no limit for the height so the bot will keep producing and i need at least 3 bots to get the plank in the storage.

There's no height limit atm. I personally use crude bots to supply workbenches to slow down tool production. There's nothing wrong to have 3 bots on planks. With over 150+ bots on my recent game I won't notice any diffecence on having an extra one anywhere :). Automation is a key, don't waste your hands on doing what could be automated.