Bleed's point in its true form is an answer to these points. You have to understand that Bleedspace is a bufferzone between realities, so it will never actually be part of any specific zone within those structures, but rather exist as the framework for all of them.
The reason you shouldn't consider Orrery Low 1-C just because Bleedspace is Low 1-C is for the same reason you shouldn't consider a 1D dimension to be infinite dimensional just because it is within an infinite dimensional framework.
Let's actually take Rodney Rabbit's statement for instance:
See, that at no point is it said that "the fifth dimension is fixed in Orrery", but rather that the "guts-of-a-cyborg" architecture in this case rotates through the fifth dimensions, and they're fixed in the orrery of worlds. Why they're? Because those are the syphons drilling ultramenstrum which is bleed in its primitive form. Anyway, this is also explained in the official DC Comics video about the map, they even explain that what gains access to all layers of the multiverse is the House of Heroes, not the Orrery of Worlds.
right here it is said that the House of Heroes can "rotate" through the fifth dimension because of those fixed points in the Orrery, which is literally what the monitors launch "sorties" into the 52 universes, in no context is Orrery placed containing 5D structures, only fixed points that exist in all of the dimensions of the multiverse, It is even said that this is
pandimensional.
So we can't just place the Orrery as Tier 1 because it has a pandimensional structure that goes in and out of the Orrery, and that structure can reach Low 1-C planes.