I personally have a 250L tank fully planted Dutch style and I placed 10 sae in it from the beginning. The tank is more than a year old with several types of plants.
In the tank I also have a few otos, around 10 Amano shrimps and a large number or red cherries as they keep multiplying.
I have seen one or two leaves from my ludwigia repens been eaten half way during this time, but nothing much. The sae tend to nimble on my dwarf hair grass a lot and keep it constantly low in height.
On my other tank which is 100L with rocks and wood I have 4 sae along side with a few otos and Amano. In that tank they have eating everything I try to grow, except from anubias and crypts. They devour my ludwigia repens, ludwigia super red, H-ra, stayrogen repens leaves, pogostemon erectus, everything.
They are sae as you can see the black strip going in the middle of their back fins. So I believe that yes they will eat several of your plants especially if you don't feed them on a dialy basis.
So it's not an easy decision to get them since it's not easy to take them out of a large tank with rocks, wood and plants. If you don't have bba I would say don't get sae. Get otos, get Amano shrimp.
Good luck to all