Holoryx is in the the VIP Room,Pulse Club, Akra's second floor, ask Orion for directions, Orion is in the Downtown.
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The difference is you can go there in two ways, if you are too submissive (slaved by Thuul) you need to ask Thuul to go to the VIP room or if you are dominant. You paid it yourself. Unlocking the The Pulse Club requires to chat with Orion in Downtown, Second Floor, Akra. But Unlocking the VIP is up to you and your character reference whether you are slaved (submissive) or dominant.
Note: If you are slaved, your actions in the Second floor is limited, especially in the Pulse Club.