Apple Watch 40mm Glass Screen Protector that doesn't fall off.

Can anyone recommend a glass screen protector that won't constantly fall off? I have bought two Cygnet Tempered Glass protectors recently, both that fell off within hours of buying. The first I thought I must have put on incorrectly even though I followed the instructions, then I bought a second which did the same thing. I then read the reviews and nearly every review said the same. Luckily I was refunded my money as they were quite expensive. I then bought a cheaper one, it did the same so tried another cheap brand, it fell off too. I just can't find a glass protector that will stay on. I'm thinking that the skin ones are the only way too go. Any ideas?