I came across some art from Kongsberg at
USNI News depicting possible launcher positions on the seperate LCS models.
View attachment 6591
One thing I noted on the Independence-class mounting (left) is that their depiction seems to indicate the desire to leave the forward module bay free for the vertical launched Hellfire surface to surface missile module (SSMM)
(remember, this bay is originally designed to only accommodate the 6 1/2 ft (2m) tall NLOS missile canisters)
For the Freedom-class (right), the only other location that I can think of to mount the launchers & possible reduce the ships signature, would be to put them in the topside decoy/chaff launcher/liferaft bay (just forward of the Mk 44 module bays). There is already hull openings (for the liferaft canisters) that could likely used for missile exhaust ports.
I figure the decoy/chaff launcher could possibly be moved a little aft, adjacent to the SSMM bay (just aft of the Mk 44 bays).
But I assume you might also need to consider the additional weight being mounted that high up on the ship having some effect during high speed maneuvering, as additional Kongsberg literature I've seen states that an 8 missile mounting configuration weighs around 17,000 lbs (7700 kilo). And, this might be even worse with a Harpoon launcher as a Harpoon weighs about 70% more than the NSM.
I included a larger version of the above image