One was on stucco and the other on uneven decorative stone. Both were mechanical chimes, not digital door chimes. Let me first say I have had my fair share of frustrations and setups with DIY projects all over my house INCLUDING past SkyBell and Ring doorbells. FINALLY, this install was straightforward and fast!If you have a mechanical doorbell like me you should have just two wires going to your doorbell. The instructions are straightforward from SkyBell, however in short you just kill the breaker, hook the two wires to the base plate genius improvement as previously you had to wire to the device and then mount it to the mount and it was a pain, now the device isn’t involved until the very end at all and then mount your mount to the wall. I have used a combination of screws and glue for these installs. SkyBell provides a nice drill bit in the box if you would like to drill two holes into the house. For my stucco installation I did use two holes, however I chose to use my own masonry bit on my stucco just to be safe. The install was straightforward and completed in under 5 minutes. For the 2nd installation I did I was on some decorative uneven stone and this was quite the challenge as it would be for any doorbell installation. I went down and got some quickrete patching material from Home Depot and filled in the grout and made a nice circle the size and shape of the SkyBell provided base.