Thanks for suggestion. Carport table is about 15' from gate and clearly visible since carport faces out toward the gate (at a right angle to it). Next to the gate on one side is gigantic shrub and fence and the other side has a very large hose holder with hose, all-house generator next to that, carport table next to the generator (which is just outside the carport). We have had them leave stuff on the generator, which is ok, although it killed a live plant because the sun glares down on the generator and we were gone all afternoon that day.
I just ordered a second sign for the gate. This is the one with an outline of a German shepherd-type dog, print above it says "I can get to the gate in 3 seconds, can you?" in English, with the same thing written below it in Spanish. Just in case they don't speak/read English.
The dogs getting out is really the whole issue. For all this bluster, two weigh 20 lbs, the third 11 lbs. Our front yard is huge, bigger than most dog parks (fully chain-link fenced), so they don't go on walks much, and the freedom of just running down the driveway and into the woods would be irresistible to them. One is a Cavalier King Charles spaniel, a highly stealable dog. They are everything to me. I'm glad you got yours back.