I'd argue that there's a fourth, even lower tier: the roleplay micronation, whose "borders" are typically the walls of its creator's apartment, which engages in "foreign relations" by way of online forums, and whose "foreign imports" are typically from the supermarket.

These are clearly of even less significance than the performative micronations in your classification. But at least their creators typically recognize this, and don't make claims which get them noticed by actual nations.