[solved] Nginx/php-fpm not rendering php for install

Try adding this block from your rpi3.lan:

        location ~ \.(php|html)$ {
                try_files $uri $document_root$fastcgi_script_name =404;
                fastcgi_pass unix:/run/php-fpm/php-fpm.sock;
                fastcgi_pass php-handler-www;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                include fastcgi.conf;

                # prevention for httpoxy vulnerability: https://httpoxy.org/
                fastcgi_param HTTP_PROXY "";
        }