Git clone to plugins.local/nginx_xaccel

Setup redirect prefix for nginx (should lead to tt-rss base directory) via .env:

TTRSS_NGINX_XACCEL_PREFIX=/tt-rss 

location /tt-rss/cache {	aio threads;	internal;	} 

More info here: https://www.nginx.com/resources/wiki/start/topics/examples/xsendfile/