Where to Connect a Phono Preamplifier into a Line Stage

Having looked at the OP's system, from what I can see on the manufacturer's (Odyssey) website there does not appear to be any distinction made among the analog inputs, so, unless the owner's manual has any suggestions, I'd think in this case that the OP can use any of the inputs.

 
Lol! What is that you're using there, Chief? Belt sander? Or random orbital?

It starts as a mountain being blasted. Combing through the rubble you find a suitable boulder. You get to chiseling. Great big chunks coming off. No idea what it is. Eventually the chips are getting smaller, a shape is beginning to take form. Only when its clearly recognizable, only then is time for sandpaper. Coarse at first, progressively finer and finer, until its time for a liquid polishing compound. Last step, oil or wax, fills in micro scratches leaving a high gloss finish.
This project here, I would put more in the chainsaw on a stump category.

Lol! They ALL have some inputs that "are more direct" than others! Look at the back- RCAs all in a row. Different distances from the selector switch. Are we now gonna quibble over one being 2cm "more direct" than another? Oh Lord, we are! Someone else gonna leap to defend them, posit something even less likely and a whole lot less relevant. Next thing you know GK, dajones be here quibbling back and forth. And that goes on for weeks, until finally one of them catches Wuhan or forgets to pay the cable bill and we get some relief. Oh well. Entertainment value. At least this time the OP got his question answered before the Samneric Show.