No, No, a thousand times No!
The Gecko clamps are designed for use on non-porous material, not plywood, MDF or similar materials.
If you wanted to use vacuum clamps along the length of a 3000mm or 50000mm guide rail while sawing plywood, they would need to use a vacuum pump. Outside North America Festool sells the Sys Vac, but it is not actually intended to clamp guide rails. Some of the vacuum clamps used in the solid surface industry could be adapted to hold rails, but considering the cost of those solid surfsce clamps, that would be a very extravagant way of dealing with a non-problem.
Nearly every day in my shop I use my 5000mm guide rail to saw plywood on angles such the cut is more than 10'. If the cut is short enough I use one of my 3000mm rails. Hardly ever do I use a guide rail to make saw cuts without clamping the rail at either end.
Yes, the guide rails have non-skid strips on the bottom, so if close is good enough, then give that a try. I do not, largely because the plywood I use is very expensive even in the large wholesale quantities I purchase. Devoting a few extra seconds to fastening two Festool clamps at either end seems a useful investment. I submit the very low scrap percentage in my business demonstrates clamping is sound business.
With the longer rails the clamps need to be onto the piece being cut, which will leave surplus rail at either end. I simply support that extra rail with spare off-cuts of the same material. As you can imagine in a busy cabinet shop we have a lot of off-cuts just waiting to be used.
So I set one clamp and support that end. Then before setting the other end clamp, I actually pull the guide rail taught.
Now, when I make the cut my TS55 is to my left side and I control it with my left hand, walking with the saw. This way I am not pushing the saw away from me and bending the rail, now am I pulling the saw toward me, which would also bend the rail.
Sure I have a sliding table saw large enough to cut 14' Some people do use them for breaking down sheet goods. When I bought that saw I thought I would use it for the miters and bevels which cannot be made on a pressure beam saw, which only makes right angles. Immediately I found more profitable uses for the slider saw and returned to using guide rails and TS55s for the miters and bevels. Often the far less expensive method turns out to be more effective and equally accurate. In the real world it takes two cabinet makers working a team to move a 10' sheet through a slider saw.
On the other hand, setting a guide rail using two clamps can be done by one cabinet maker. Or, if a helper/apprentice is available, handling one of the clamps becomes a marvelous learning experience.