If you have an Enterprise license(s) you could use the 'Cave Manual Configuration' option in vizconnect and select front wall and floor. In the 'side image width' field enter the floor depth value.
If you're using a Development license this can be done through vizcave code directly. See the
vizcave single machine example. However, there is no built-in vizconnect option available, it would require manual changes to the vizconnect code.