Monitors
what monitors are compatible with a MacBook Pro (retina, 15-inch, late 2013)?
MacBook Pro 15″, macOS 10.15
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Your model supports up to 2560x1600 on two external displays via Thunderbolt. Alternately, it can support a single display up to 2560x1600 via Thunderbolt and a single 1080p display at up to 60 Hz, 3840x2160 at 30 Hz, or 4096x2160 at 24 Hz via HDMI.
So, with HDMI anything up to 4K (3840x2160) will run at 30 Hz. Since Thunderbolt (original) is physically the same as and compatible with mini-DisplayPort, you could drive two displays at up to 2560x1600 via mini-DP-to-xx adapters (where xx is DisplayPort or HDMI depending on the display input).