This is the controller I would go with for 2x brushed scooter motors. It will push out up to 190amps so plenty of power, cheap, and I have abused mine for years without issue.
https://www.ebay.com/itm/24V-36V-700W-48V-60V-1000W-Waterproof-Brushed-Scooter-Controller-With-Throttle/162711259891