As far as I've seen, you can only place them when zoomed I to radar view. My solution for larger prints was to split them up into sections.

You can landfill with bots if you shift+click with landfill. Always worked for me unless I'm using a mod that changes the landfill.

It is Resource Spawn Overhaul. It gives better resource generation than vanilla.

It is a feature. As stated above, the filter option only prevents unwanted items from being stored in the chest. If you want the item to be requested you need a requester chest.

You can use Angel's Ores to get infinite ore. If you use it with RSO part of regular ore patches will spawn as infinite. Otherwise they just spawn randomly on their own.

I am willing to team up with you if you are still looking. I haven't tried any multiplayer games yet and would like test it out.