May I suggest cleaning your pool manually, that way it's quicker and you won't miss bits and that saves on the cost of a robot and the extra electricity to run it. Pool Blaster Max with the extra fine bag in it will do the job in the quickest time by virtue of no hoses etc to get out/put away again.
Unfortunately people disagree about what really works in a pool but running the pump on low speed 24/7 means leaves that hit the surface are deposited in the skimmer before they get waterlogged and sink (that's why you need a robot) the downside of this technique is you have to empty your skimmer more frequently. I sold my robot 3 season ago as it wasn't needed, was too slow to clean the whole pool and missed bits.

If you can't resist the urge to spend on a robot buy one with remote steering then you can guide it to the spots it misses. Any one who actually believes these things learn your pool is deluded.