Hello Aspirant,

Your category rank is good and according to your rank their are many nit's where you can get seat with ECE branch. But it is not necessary that they came under top  15 colleges because college ranking is depend upon various factors so here I listed some Nit's where you can get seat with ECE branch:-

Nit Srinagar

Nit Hamirpur

Nit Sikkim

Nit Agartala

Nit Manipur

Nit Andhra Pradesh and many more options for nit and iiit so for more you can go through the given link to predict your college:-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope this information helps you.

Best of Luck!!