I've got the Tapo P304M and it works great, but unfortunately I have some other extension cables which need more than that; most being 8 or 12 plugs. Being able to have energy monitoring on my extension plugs would be great, and potentially more cost-efficient than putting on individual P110(M)s on each separate socket. This would also be helpful to stop multiple plugs in an extension taking up one IP per plug, if it's instead one IP per extension plug system.

Would love to add to my Tapo collection; I'm surprised TP-Link haven't tried going for more than 4 sockets on an extension plug already!