If the non-illusory status of spatial representation depends solely on intersubjective necessity rather than mind-independent correspondence, this conflates coherence with truth in a question-begging way.

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Conflates(in argumentation and logic): Treats two different things as if they're the same thing, or mixes them up in a way that causes confusion.
Truth(Horkheimer's critical theory epistemology): The relation of propositions to reality, where both human conceptual activity and an independent reality are given equal weight.
coherence(Applied uniformly by Bosanquet to both religious and non-religious truth claims.): The standard by which truth is assessed — a belief or system of beliefs is true insofar as it forms a consistent, internally unified whole.
intersubjective necessity(a possible foundation for whether spatial representation is real): Something that must be true because multiple minds or people all agree on it and need it to communicate, rather than because it exists independently in the world.

Based on where you are in your exploration

mind-independent correspondence(the traditional way of understanding what makes something real)

The idea that something is real because it actually exists in the world outside of anyone's thoughts, matching up with how things truly are.

non-illusory status(determining if spatial representation is genuinely real)

Whether something is real and not just a trick of the mind or a false appearance.

question-begging(Epistemology, anti-skeptical argumentation)

A charge leveled against anti-skeptical arguments that assume what they set out to prove, particularly in Putnamian externalist arguments

spatial representation(what we're trying to determine is real or illusory)

The way our minds picture and understand space, distance, and how objects are positioned around us.

This idea is waiting for its first supporting or challenging perspective.