There is no one answer to this question. I have worked with and successfully bred many types of monitors and they are all about the same. They either get along or not. You can flip a coin, cross your fingers do whatever you want, but none of that will help, all the time. Actually a coin flip is the most consistant.
If you have a choice, raise young ones together, the younger the better. This helps. But doesn't always work. It ups the percentage some. Youneed to socialize your monitors, that is, have them understand what it is to be stuck in a cage with another monitor. This is common with all sorts of animals. Its better to raise them in the company of what you expect them to live with. If you raise them alone, and have only your to relate to, you cannot expect them to be good canidates for a breeding pair or group.
All in all, its trial and error. You just got to give it a go, and react to the results or not. In your post you mentioned you understood its a little about individuals. It really is, and its about individual people as well, some are tolerant of slight interactions and others flip out at the least little thing.
So give it a go, oh one more question, how do you know the sex of your monitor? as this is where the most errors are made. Good luck FR
