A couple of robots?
Or one big one?
There are some commercial models that may suit you, they seem expensive until you start factoring in the cost of labour.
It gives me a nice warm glow to watch mine running around in the rain while I sup coffee.
I made the switch to robot mowing a few months go. Should have done it years earlier. I now have four conventional mowers to fix and sell off (a diesel Toro 3 wide cylinder mower, two Countaxes, a 36 and a42", and another ride-on for scrap/spares).
On the robot, I got a Segway X350, as it is all GPS and beacon based, no wire to bury. Cuts in straight lines so lawns look neat. The robot is completely quiet, other than it bleeps when it turns on the blades or reverses.
On the plus side, the lawns have never looked as good and it has saved a ton of time. Also no maintenance or repairs, other than change the blades every month or so (they are cheap on Aliexpress). On the old mowers, so much time is wasted on maintenance, in addition to hours of cutting every weekend in the summer.
On the reality checks: Someone has to check each day that the robot has finished and got home to its charger. Any muddy section, tree roots etc, will cause it to get stuck. Stop it going into problem areas by installing a low wooden edging (100% effective), or add a keep out area to the map (usually works, but not always).
On things I did not know until I bought it:
1. It is supposed to be able to cover 7200 square metres, which is 1.8 acres. In reality the max is 2/3rds of an acre, as it cuts lines only 7 inches wide and takes all night. Night cutting is slower than the day. So whatever you get, assume it can do 1/3rd of what is claimed. Every 2 hours of cutting it has to go back and recharge itself, so doing 0.6 acres involves 2 or 3 recharges. I question how long the battery will live at this rate of recharging, essentially, recharging 1000 times a year.
2. The Segway Navimow app is good, but one update altered maps causing the whole lawn to move 3ft to one side, meaning the mower gets stuck and you end up with a strip on the edge that is not cut. One then needs to go around it with a normal mower. On access ways between mown sections: it does not cut them, and when the grass grows the robot thinks the grass is an obstacle so turns back: to avoid this include the access ways as part of the lawn. Remapping takes the same time as changing the easiest of the three belts on a Countax, so not a big deal.
3. Anti theft relies on the battery, which is flat whenever it gets stuck, so put a 4G tracker on the mower that does not bleep all the time like Apple airtags do.
The robot has openned up new gardening possibilities. This month I am clearing up an acre of woodland within the garden, to plant a rose garden between the trees. Impossible given my time when using conventional mowers, but with a robot it can keep all the paths and edges trimmed for me. The stone wall around it has just been repointed, and the forest mulcher is coming in this week to clear everything between the trees I wish to keep, then in August the roses and other plants will go in, to give them a start before autumn and winter.