Templar Assassin lane

I really like this hero, yet I don't want to take her mid. I am very comfortable playing pos 1 and it is my favorite role. How viable is playing a TA safelane and farming up? I see many things which say TA is a carry, yet I don't know when the last time I saw her in a pos 1 slot. Is this viable/worth or should I lock another carry instead? Should Treads be picked up instead of phase?