And to follow up on that, tortoises are very territorial. There is always a dominant animal if you have more than one. Pairs fail as the subordinate tortoise cannot escape the attention of the other tortoise.
Groups of 3 or more may be successful as long as there is no more than 1 male and they are all the same size and species. The enclosure for such a group must be very large and have plenty of sight barriers. However, there are no guarantees so you should only keep as many tortoises as you have room for separately.
Any new tortoise must be kept entirely separately for at least 6 months in order to be sure that no tort makes any other sick.
And don't forget that Leopard Tortoises grow pretty quickly into very large animals that you will struggle to lift and carry
The best tortioses to put with him is two more red footed tortioses from the same location or same subspecies . Tortioses do not like to be put in pairs . They do not like or need companionship . All they see is competition. But red foots do well in groups . Never mix subspecies . Always quarantine new animals for at least 6 months no matter where they came from . One sick tortoise could kill your whole herd.
Ditto above and if you search the forum you will find all kinds of threads asking about mixing species and how it should never be done. Same with a pair of torts is not a good idea.