Both the XL4 and Mini have MoCA built-in, so you're good to go. Just make sure to have the XL4 configured to bridge its ethernet and MoCA connections so the Mini can see the rest of the network.
Sony SVR-2000 (S1) @ 160GB (retired)
TiVo TCD648250B (S3, Lifetime) @ 1TB (thanks
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TiVo HD XL (S3, Lifetime) @ 1TB - CableCARD/TA
TiVo Premiere XL4/Elite (S4, Lifetime) @ 2TB - CableCARD/TA