How are Mega Limits calculated?

I'm curious how the Mega Limits are calculated, as they aren't always the same, and I haven't seen an explanation of them. For numerous reasons killing the breaker is not an option I can or will use. I must therefore try to meet what seems like a frustratingly and arbitrarily low limit(divorced from any reasonable energy savings); often my limit is 0.021kwh. My DSL router, which must be left on so I can remotely verify my smart-plugs worked(they haven't always), the smart-plugs themselves, and my answering machine take this entire limit and leave zero wiggle room. I'm thinking of buying a $25 UPS to cover the router and answering machine, and putting that behind a smart-plug. This should get me ~8 watts of wiggle-room, but I suspect that Mega Limits might be based upon the lowest value seen which means my limit will drop to match my savings and I will have accomplished nothing but spending money. I'm also worried that if I move a few other devices to smart-plugs so that I don't have to remember to unplug them before I leave on OhmHour days, that the smart-plugs themselves will use enough to push me over the Mega: I might put a 40 watt device I sometimes forget to unplug on a smart-plug, only to have the 1 watt usage of the smart-plug push me over the Mega limit every time instead(so somewhat ironically, the ridiculously low mega hour limits are discouraging me from trying to make my home smarter for all Ohm Hours).

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