Is this eligible with the Mountain Buggy car seat adaptor?

Hi Dani, Yes — the Maxi‑Cosi Mico Luxe – Midnight Glow is compatible with Mountain Buggy strollers, provided you use the right adapter. Mountain Buggy offers the Clip 31 adapter set, designed for their Duet™ stroller family (and similar), which supports Protect™ seats and “Maxi‑Cosi style” infant car seats like the Mico, Mico AP, CabrioFix, Pebble, Nuna Pipa, Cybex Aton. Hope that helps