We bought a 75" for our new house and the place it needs to go is above the fireplace mantle. I don't really want it that high so I am looking at pull-down mounts from Mount-It.
All their mounts say they need to go into a stud or a solid surface. Our fireplace is rock.

Any suggestions? Should I just get the best masonry bolts/lead sheaths/etc and go with it?

I've sorta done both in recent years so I'll share what I know.

I have an over the mantel TV in the house and I use this mount (link below). This was a drywall install. Once you get it adjusted it works really well to bring the TV up or down.

https://www.amazon.com/dp/B01N5JMX8G?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_8


I also recently mounted a 75" TV outdoors into our limestone wall above the fireplace (just a standard wall mount). I ended up using heavy duty plastic anchors (linked below). Normally when installing into drywall I just use 4 heavy bolts into studs and that's more than enough. For this application, installing onto an uneven limestone surface, I think I used 8 (maybe 10) total anchor points just to make sure.

I don't have a hammer drill and I was having a heckuva time drilling good holes on mine, so the plastic anchors worked well to get a strong hold. Had to get a few longer screws because of my uneven surface. But if your install is on a more level surface and you are able to drill clean holes with a masonry bit, I would think Tapcons would work just fine if you preferred that over the plastic anchors. But you might consider doing what I did, use more than 4 anchor points since you aren't going directly into a stud.

I'm not a professional by any means, but I'm pretty handy and I made sure to say "that's not going anywhere" after my outdoor install... so far so good.

https://www.homedepot.com/p/Triple-Grip-12-Green-Anchors-with-Screws-40-Pack-173K/203706988

Agree with jr15! I mounted a 50" on my patio this weekend on my brick with this kit and it went pretty well.

https://www.amazon.com/dp/B07CQ4952W?ref=ppx_yo2ov_dt_b_fed_asin_title

Don't know about rock but it worked great for brick. I checked for reddit threads and everyone pretty much said for masonry use a lag bolt and Fisher anchor. A bunch of them said don't bother with tapcon screws and use a set up like this.

I went for a TV mount that had 4 bolt holes instead of 2.

We have the Mantle Mount. I put it up myself, not overly difficult. We're happy with it.

Send me an email I can likely beat any price hands down on a mantle mount.