The options are really limited here, so just plug one into the 3.5 leg, and the other into a 7 leg.
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Masturbation is the answer!
I would suggest getting a balanced 3-way splitter this will provide an equal loss of 5.5 dB on each leg.
2008-11-10 17:24:08 (TTcntrctr101)
Just a side note as a technical trainer for a large cable company in North Carolina... When available, you could also implement a balanced 3 way splitter which has 5.5db of loss per leg, connecting the two modems giving even distribution to all ports including the additional port for television services.
your best bet in this case would be to get your hands on a balanced three way splitter. the loss across all three legs is the same usually 5.5 dB