Low hovering craft with no sound

Was driving when we saw a craft in the sky flying very low roughly 100-200 feet above the ground. It moved incredibly slowly over to a new construction site where they are clearing and levelling land.
The craft then dead stopped and hovered for roughly 2 minutes, it then moved up and down over the construction sight in a linear pattern again no noise present.
We then drove off and it processed to tail the car incredibly slowly for roughly 20seconds.
It then WITHOUT turning took off I'm the opposite direction at incredible speeds
The craft appeared as a cross from a distance but once the craft was hovering above you could see it was almost diamond shape with some type of either tail or nose. It has blue red and piercing white strobing lights that were difficult to look at and did not resemble any type of aircraft lights we had ever seen before.
Main takeaways,
No sound
Strobing lights
Cross like shape with barley visible diamond shape wings
Hovered with no movement
Speed varied from as slow as walking speed to incredibly fast
Followed us one way but flew off the opposite direction WITHOUT turning