150x150 is a fantastic size for big yields! I would grow 9 plants in a tent that size. 3 rows of 3.
To maximize yield make sure you buy proper lighting. Lighting a 150x150 tent to get high yields wont be cheap. Youd want either a double ended 1000w hps(2x 600w would also work) or 600w-750w of high-end leds like from kingbrite off alibaba. O would personally buy 4 of the kingbrite 240w lights, 1 for each corner of the tent. You could also grab 2 of the 320w lights and have 1 over each half of the tent. The 4 240w pights will offer the best light spread and be more than enough light to achieve the highest yields for the space. The 2 320w will be a little cheaper and still adequate for high yields, just not as good as 4 240w.
This is the specific light I would recommend getting 4 of to cover that space.
https://m.alibaba.com/product/60804816911/detail.html?activity_id=icbu_minisite_web&channel=minisite_a2706.wapshop.113.i0&from=icbu_minisite_web&isFromApp=1&scenery_id=2&language=en¤cy=USD&spm=a2706.wapshop.113.i0&_aplus_page_enable=true&wx_navbar_transparent=true
If you have any other questions or need some advice, feel free to dm me! Good luck!