GIRLI really dislike Maddison but I would choose, in order:
1. Maddison Emilie Rob
2. Maddison Kate Rob
IMO a middle name with more than one syllable seems to flow better with your surname as it's only one syllable itself. I know Kate is only one syllable but it does sound ok. I love Paige and Jade is ok but they don't seem to flow at all with your surname.
BOYI love Samuel. I like, in order:
1. Samuel Thomas Rob
2. Samuel David Rob
Joel is nice too but IMO it doesn't flow with Samuel as they both end in el.