Hi,
The [SIP/123123&SIP/98098080] is invalid. fop2 will probably monitor nothing in that regard. There is no risk, it is just like putting [MYHEAD/hurts-so-much] . So I do not know why it is the only way it works for you?? that seems pretty strange. You can also use [Local/exten@context] so that is used as origination, and add the real devices on channel entries...
If you get any status out of the concatenated device it is a probably a mere coincidence. The "good" way is to do it using additinoal channel entires and let the main one between [].