You would NOT want to put other new snakes near this one at all, until ALL have been quarantined for a sufficient length of time & proven healthy.
If the new ones are coming from the same source, they can be quarantined together, but not near this one nor near any others you may already have.
IF you cannot do that due to lack of space, I would hold off on any additional ones- quarantine is really your most effective option to keep your animals safe, & not sharing pathogens or parasites.