so I bought these Splitters, one 4-way and one 2-way, thinking they would work.
Yeah, “satellite” splitters aren’t a good choice for a MoCA setup. Try grabbing similar splitters from the MoCA-optimized Antronix MMC1000-B series. (Amazon link)
Related:
- MoCA-compatible splitter recommendations (… and warnings)
- preferred MoCA filter: PPC GLP-1G70CWWS (Amazon US listing) … 70 dB stop-band attenuation, spec’d for full MoCA Ext. Band D range, 1125-1675 MHz
A MoCA connection would require a minimum of 2 coax outlets, one at/near the router and one elsewhere. Else, there isn't any coax over which MoCA could be used to create a network connection.