gtg said: Please note that setting up all seed nodes in a single data center won’t help. A DDoS attack targeted at that particular network will bring all your nodes down anyway.

That is unless the data center provides a variety of network routes from different providers and your seed nodes are therefore located on different wide area networks even when on the same LAN. This is possible on today's top of the line data centers.
Of course decentralization is always good so several locations for seed nodes and witnesses is a plus. Good post.
Just installed a witness node. Consider to Vote for witness okay