You can use an audio DA or a video DA. Timecode is most similar to an audio signal, and apart from it being best to avoid passing it through transformers (which try to reject DC, a central part of LTC timecode), you can treat is as a line level audio signal, including balancing and unbalancing it and adjusting levels. It also happens to be close enough to an analog video signal to use a VDA.
You can also get away with splitting the signal passively, for instance with an XLR Y cable.
Here's a specific recommendation: use a balanced audio DA with XLRs, and ideally level control on each output. Use XLR to BNC, or XLR to RCA with BNC adaptors to feed your decks (some decks may have XLR or RCA inputs). Don't be afraid to throw a few XLR Y's in if it makes cabling easier, especially if two decks are near each. *Do not* try to use any decks timecode output, loop-out or similar to feed other decks.