I too often work from ‘home’ and on one occasion the guy said he was walking to my door & a white BMW slowly drove passed with two Asian men in the front, looking towards my house as they did - I could see them through my door spy hole-thing.
The guy never showed up and went ghost.
I’ll never know if it was them or not, but it was too much of a coincidence.
I locked the door, turned the lights off and couldn’t work for the rest of the day.
I’m not sure how you can safe guard yourself even more? I think a ring doorbell would deter any clients, but would be so helpful for us! I always give out the postcode next to mine, so they need to walk a little further. I’m very very selective and screen them as much as possible before I’ll even meet. Luckily, most of my clients turn into regulars and I really trust them (as much as you can trust a client).