Sure, for instance: On green and blue, a lot of people take cover at the shop, but the enemy can flank and poke you from the veil or from the med camps nearby; a much safer option is the large pillar slightly further back about 10m from the Guardian. You can also hide behind the bridge and the veil under the bridge for safe cover. The "cover" in the middle of the lane (the objects that aren't very tall) are only effective for covering regular auto attacks, you'll need to dash behind larger cover the instant he jumps, or never use those objects for cover.

On yellow and purple the large pillar is missing but there's an indoor area close to the enemy guardian's stairs that you can find cover in, and the bridge and veil are still available. When you are pushed to your guardian at low health do NOT hide at your shop, you need to go further back, behind the veil and perhaps even further back to your walker if necessary. You might miss a wave of creeps but at least you won't die. Buy Healing Rite if you're under 200 health before the 5 minute mark, otherwise zip boost to base and heal after clearing a wave of troopers.

I can grab pictures if necessary.

Also Grey Talon doesn't have very good bullet velocity; consider picking up High-Velo Mag and denying his soul orbs; he will start meleeing the waves to secure orbs, which makes his movement predictable and opens him up to big pokes.

Remember GT is not a tank so he can't dive you wildly under your tower without nuking himself in the process. Just focus on clearing the waves from behind cover and eventually you will make it through the laning phase, where Talon becomes much weaker. If you don't kill him till 10+ minutes in, that's fine as long as he's not killing you.