It doesn’t eliminate the smell, but air purifiers can reduce it significantly. We have a decent one in the room where the litters are that turns on on a schedule. It’s a bit annoying that if the cats use the litter just when it’s turning off then it’s kinda no use.
My long term plan if I ever get around to it is to build a cupboard type thing to put their litter in with an extractor fan to the outside.
Litter robots could help, but all the people I know who have them said they just replace some issues and chores with other issues and chores in the end.