D&C 20:76 And the elder or priest shall administer it; and after this manner shall he administer it--he shall kneel with the church and call upon the Father in solemn prayer, saying...

Note that in both scriptures it says that the person blessing the sacrament will kneel WITH the church and not FOR the church or IN FRONT OF the church. No, WITH the church, that is to say WITH the members which together are the church.

This very issue was discussed in the 1890's and was dismissed by Joseph F. Smith as being "rather impracticable":

"I want to speak of one or two little things that have been brought to my mind here and at other places, which may be profitable to some of us. I would like to call the attention of the congregation, especially of the Bishops, to the mode of administering the sacrament. The book of Doctrine and Covenants teaches us that the Elder or Priest who administers the sacrament 'shall kneel with the Church.' Of course, it is quite difficult, and probably inappropriate, for a whole congregation to kneel while the blessing is being asked upon the bread and upon the water. The confusion and noise incident to kneeling and rising again would be inappropriate. Besides, the construction of our meeting houses, and the size of the congregations generally, would make that practice rather impracticable." (Collected Discourses, Vol. 3, Joseph F. Smith, July 16, 1893)

Difficult? Probably inappropriate? Confusion and noise? Construction of our meeting houses? Size of congregations? Impracticable? Sounds a lot more like excuses rather than revelation to me.