I know what you mean, it depends on neck length/size and unfortunately most neck braces are not one size fits all. The ‘harp handle’ i use is still the best I’ve found on the market as it has an extra adjustment and I’ve managed to find a good spot for it. I tilt mine as close to my neck as is comfortable and then line up the silver holder part with my chin, which gives me that little bit of room to sing over.
Having said that I am developing a new holder with 3 adjustments so you can get it exactly where you want it.. I’ll let you know when that is ready. Hopefully by the end of summer! I think it’ll help a lot of harp/guitar players like us 🙂