Let me chime in as I was a dealer who was heavily involved with these boats. First I am not sure where the boat is sitting either on the trailer or in the water. Whatever you do, always if lifting with straps, tie the straps together so they cannot slip out. Secondly, always put chains between the stands so they cannot pop out. One other thing, keep children from the area but most importantly, not under the boat and instruct them to leave the screw jacks alone.
Usually where the bunk boards support the hull is a good starting point where the hull is the thickest and there are no real support ribs in these boats. I would advise 6 stands but eight is better for distributing thewieght as there is no keel for the boat to rest upon the ground. Since you have a 26, generally just forward of the bunk board and in the rear just about a foot from the end of the bunk board or above the rear support of the bunk boards. Then I would place one somewhere in the middle. You can thump or tap the hull to find the thickness of the hull. A bow support would be great but half of the time I did not use them as I had a yard full of new and used boats.
If you find the hull is caving in, check your stands or you may have to move a stand. If moving an end stand, make sure you put a temporary stand next to it. Again chain up those stands used in pairs.
I hope this answers as I lost count over putting stand s under the 26/260 starting at 1,000 times