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Arban says in his Method for Cornet:

"The mouthpiece should be placed in the middle of the lips, 2/3 on the lower lip an 1/3 on the upper lip. (...) Horn players generally place the mouthpiece 2/3 on the upper lip and 1/3 on the lower, wich is precisely the reverse of what I just recommended for the Cornet."

When I play tuba or euphonium I use something like 2/3 on the upper lip. Just like what Arban said it was a reversed embouchure...

Is this correct or acceptable for the tuba?

Mary Ann or other French Horn player, when you play french horn you use the same position of the mouthpiece then when you play tuba?

Thank you

Antero.

I would start with the mouthpiece 1/2 & 1/2, directly in the middle of my mouth. Then from there, if it doesn't quite get you what you want, move it ever so slightly in one direction at a time until you find the right spot in your embouchure, and hopefully with a teacher to help guide you. Because of my teeth structure, mine is about 1/2 & 1/2, but the slightest bit off to my right, and tilted up at the rim (down at the shank, or with the lead pipe angled up) just a smidgen due to a slight overbite. But you must find your spot for your anatomy. If it's too far off center, you may lose flexibility and tone, however. Don't forget to consider rim contour and cup diameter, as too small will not let you have complete range, too large may not fit to your embouchure. If you find you are constantly adjusting the mouthpiece, you may need to change one or both of the characteristics, not necessarily a fundamental change of your placement. If in doubt, consult a good low brass teacher.