As I continue to work on newer and newer vehicles, I'm noticing that modern vehicles are getting to the point where the only safe jacking points are the four designated frame points that a two post lift would grab and use. Until now, I have been doing everything with vehicle ramps or floor jacks and jack stands, but that was becoming a hassle and a bit of a safety hazard in my opinion. The problem I was running into, was that as soon as I jacked up one side or one end of a vehicle with my two floor jacks, there weren't any good locations left to put my jack stands so I could safely work under the vehicle. They usually ended up being carefully placed somewhere near where main suspension parts connect to the subframe, but I never really liked those locations in general. I also disliked having to temporarily trust my hydraulic floor jacks while crawling partway under the vehicle to find and place my jack stands in those locations.
I decided to solve the problem by making some safety supports for my floor jacks. How they work, is I raise the floor jack to just above the level I need it to be, then I place the short or tall 4x4 wood block underneath the floor jack's saddle and slowly lower the jack until the jack provides just enough downward pressure on the block to keep the block from moving around if bumped. That block makes it physically impossible for the floor jack to drop, even if the hydraulics fail catastrophically.
It likely wasn't needed, but I used scrap steel I had laying around to cover the top of the wood blocks to reduce wear and spread the point stresses on the wood out more evenly. I also had some extra Simpson Strong Tie steel banding laying around, so I wrapped it around the 4x4 blocks as an extra layer of protection against splitting or failure of the blocks over time.
Now I can avoid jack stands entirely (without having to worry about the floor jack letting go) if I'm just going to be working next to the vehicle doing tire rotations, struts, wheel bearings, or brake work, and whenever I'm physically working under a vehicle I can still use jack stands but they will be there more for added safety instead of being an absolute necessity. I also no longer have to worry about relying on the hydraulics of the floor jack while I'm in the process of finding strong points to place the jack stands under the vehicle.