The only time the tabernacle should be at an altar other than the high altar is in the Cathedral because it impedes the ceremonies, where the bishop has to sit with his back to the tabernacle for much of the ordination ceremonies, etc. This seems to be an argument for keeping the tabernacle somewhere else when the Mass is said facing the people, since the priest would have his back to the tabernacle the entire time. The solution seems to be obvious. Return to saying Mass ad orientem, which Cardinal Ratzinger’s works, if they were adamant about anything, were certainly adamant about the Mass facing the people being an innovation that makes no sense liturgically and leads to a man-centred worship.
There aren’t really specific rubrics for the minor servers of the Mass, though they should follow the general rubrics prescribed for the ministers. The practice of kneeling before the celebrant (e.g., at the imposition of incense) and genuflecting to him rather than bowing are proper to an ordinary who has the use of pontificals (usually the diocesan bishop), though I’ve heard of this happening in the Novus Ordo for simple priests. I wouldn’t be qualified to speak about whether it is permitted in the new rite or not. It seems a bit over-the-top for a simple priest, though. There isn’t anything wrong with reverencing the bishop with a genuflection, though, even in the presence of the Blessed Sacrament reserved in the tabernacle, it doesn’t seem. When the Blessed Sacrament is exposed for public adoration, all signs of reverence of this nature are omitted (bowing to ministers or servers, genuflecting to the bishop, kissing the celebrant’s hand, etc.) except for those that are intimately tied to the act (e.g., bowing before incensing someone or giving the kiss of peace or kissing the celebrant’s hand when the deacon hands him the chalice at the offertory).