The Vello 2.5mm Remote Shutter Release Cable II for Cameras with Sony Multi-Terminal Connectors connects to the side of the Sony A7r3 in the mulit/micro USB terminal.

Yes, this Vello 2.5mm Remote Shutter Release Cable II for Sony Multi-Terminal Cameras does work on the Sony DSC-HX99.

While the Sony RX0 II does have a Multi-Terminal Port to accept this Vello 2.5mm Remote Shutter Release Cable II for Cameras, Vello would not offer a remote that can control the functions in this camera.

Yes, the following cable is designed for the Sony multi-terminal cameras and will adapt to the following Sony units. Alpha: a1, a9 II, a9, a7S III, a7S II, a7S, a7R IV, a7R III, a7R II, a7R, a7 IV, a7 III, a7 II, a7, a6600, a6500, a6400, 6300, a6100, a6000, a5100, a5000, a3000, a99 II, a77 II, a68, a58 Cyber-shot: RX1R II, RX10 IV, RX10 III, RX10 II, RX10, RX100 VII, RX100 VI, DSC-RX100 VA, RX100 V, RX100 IV, RX100 III, RX100 II, HX50V, HX90V, HX400V, HX400, HX300, and ZV-1

Unfortunately no. The ZVE10 does not accepted a cabled remote. Only wireless remotes such as your smartphone or this Sony bluetooth remote: https://bhpho.to/3XR36Lm

Yes the Vello 2.5mm Remote Shutter Release Cable II for Cameras with Sony Multi-Terminal Connectors is compatible with the Sky Watcher GTI and the Sony A7R4 camera.

No, the Vello 2.5mm Remote Shutter Release Cable II for Sony Multi-Terminal Cameras does not work with Pocketwizard triggers.

The Vello 2.5mm Remote Shutter Release Cable II for Cameras with Sony Multi-Terminal Connectors is compatible for connecting the Skywatcher 2i star tracker with the Sony A7R4 camera.