It’s a big question that does come up a lot, and here’s my 2 cents...
Short answer : no
Long answer : depends
So let’s get this straight- in the wild, snakes coexist together for the most part. You’ll more often than not find various species (of both predator and prey) living together harmoniously without all that much trouble.
Thing about the wild is that, even in a relatively small area, there’s going to but dozens of levels, temp gradients, hides ect.
It’s almost impossible to replicate these in captivity in a tiny box. You just simply can’t give the animals enough space, enough hides and enough heat gradients in a 90x60 box. Eventually animals kept in a small space will come into contact, and might (even accidentally) kill one another.
I’ve seen and heard about some very interesting ‘reptile couples’ over the years that have gone successfully. One common thing they have is the ‘enclosure’ is bigger than my bedroom. They are absolutely huge and give the animals plenty of space to move away from one another and to enjoy their own favourite basking spots and cool places and hidey holes. I believe Taronga Zoo keeps their GTPs with Green Tree Frogs very successfully- owing to what I can only assume is the vast space they all have to move, and some very well fed animals. Is there a risk? Of course. Those snakes might one day decide froggy looks like a nice snack, but the risk is far less than keeping they same pairing in what most keepers will put a GTP in.
And again with BTS- people will tell you not to keep them together in an enclosure as they can and will bite off each other’s tails and toes, but so many people have so much success cohabiting multiple blueys in a large outdoor pit. Still the risk? Yes. But again, so much less so than keeping them in a tank.
And yes, maybe you’ll be among those lucky people who have cohabbed solitary animals their whole lives and gotten away without so much as a scratch. But you have to consider if it’s worth it. As easy as it would be for me to get my Stimmie a ‘permanent’ girlfriend to live with him full time, I’m not going to because I don’t want to come home to something gone wrong. If I could ever find the funds to convert my entire bedroom into a snake utopia however, I would have to reconsider