The tp-link ac1350 eap225 (v3 and above) supports 2x2 mu-mimo on the 5 ghz band, alongside a 3x3 mimo single-user configuration on the 2.4 ghz band.
mimo specifications
• 5 ghz band: supports 2x2 mu-mimo (multi-user multiple-input multiple-output) using 2 spatial streams, delivering up to 867 mbps via 802.11ac wave 2 technology.
• 2.4 ghz band: supports 3x3 mimo (single-user) using 3 spatial streams, delivering up to 450 mbps.
• total antennas: it features 3 internal omnidirectional antennas (configured as 3 for 2.4 ghz and 2 for 5 ghz shared internally).