How would i motion track in blender using a video from roblox?

Ok so basically how would i do this ive looked at about 5 tutorials and the problem i keep running into is when i go to set my floor it never lines up correctly its always some weird orientation my best motion tracking run had a solve error of NaN for some reason i think thats good but im not sure the trackers were good and had low spikes in the graph editor.
This is what it comes up with every time i try to set the floor.
These are the trackers i have selected.
Please tell me if there is any way to fix this ive tried so many times and so many tutorials.
Also is this the right topic?