I took my personal BIAS bugnet and trimmed it shorter than our customer version (meaning the distance from the ridgeline to the bottom area where the shock cord draws up).
I did this to trim weight and bulk. When I'm in my favorite double layer hammock and cinch the net shut under me, it leaves a large hole... way larger than the dinner plate hole you mention. In fact, it just tucks enough to hold under the hammock. I call it perfect because it holds in place perfectly and offers enough coverage to wrap me completely -- except underneath where my double layer offers enough protection.
While I am mosquito-phobic, I like this because as long as the net seals under my hammock, critters can't get at me. Whether the opening is the size of a silver dollar or the size of a pizza box, or the size of mine, I don't find it troublesome because the bungee pulls against the hammock bottom and creates that seal. Some might say critters can bite through the hole in the bottom through your single layer hammock, but I am usually clothed and/or on top of a blanket or pad or using a UQ.
I spent four days in rainy weather in the woods of southern Missouri where mosquitos were active and while they bit me around the camp fire, they didn't get me in my net.
I am not sure the size of the opening matters as long as that bungee seal is created. Some may disagree, but that's my take. I am sure areas with more crawlies and a denser mosquito population might challenge this concept (I think of a summer experience in Reelfoot Lake, though the size of the hole seemed a non-issue to me versus the cloud of mosquitos that virtually nothing could stop).
Now carrying the Mini Tattoo Stove!
Light weight. Low prices. Great gear.