If you compare it to a regular informant, say a group of bank robbers. An informant within the group may offer use of a premises to run and store the heist goods in, which allow the cops to monitor and observe everything. Would that be entrapment?

IANAL, but I think for it to be entrapment, the informant would need to suggest the job and provide the material assistance. If they simply provide assistance, then I don't think it is entrapment.