A letter can look sharp on screen yet be fragile as a small cut-out part. Narrow strokes, tiny openings and separate dots matter more than overall letter height. Assess the shape at the size you want produced.
Look at the thinnest section
On letters with thick and thin strokes, the narrowest part often determines vulnerability. A simpler letterform may work better at small sizes than a fine typeface. Do not alter a brand logo without agreement; discuss simplification where needed.
Separate letters or text cut into a sheet?
A separate O contains an internal piece that is removed after cutting. A stencil needs that piece to stay in the sheet, using material bridges. An engraved O leaves the sheet intact. Decide which result you need first.
Read about stencils and internal shapes to keep loose pieces attached.
Material and mounting
A fine wooden letter handles differently from an acrylic letter. More thickness changes the edge but does not automatically make a thin projection usable. Consider removing film and positioning the part on the substrate too.
Test the smallest letter
Make a trial of the most vulnerable letter and a representative internal opening. Try the planned mounting and read it from the actual distance. A general minimum letter height is not a substitute.
Convert text to vector outlines before uploading. For a complete wall logo, read about size and positioning.