will this cause any problem

i have recently build a pc R5 5600 Rx 6600 PSU 650W but the problem is that i only have one socket to connect it to,so i was using an extension cable but my games were keep on crashing so i bought a ups of 600VA(I wanted to buy a 1500VA but the shopkeeper convinced me to get the 600VA one because according to them it will give me same backup of 15min,its a offline UPS btw) Will it cause any problem or should i put another socket and connect it to an inverter? I have connected my pc monitor and Am extension cable where i charge my phone and laptop.

i have recently build a pc R5 5600 Rx 6600 PSU 650W but the problem is that i only have one socket to connect it to,so i was using an extension cable but my games were keep on crashing so i bought a ups of 600VA(I wanted to buy a 1500VA but the shopkeeper convinced me to get the 600VA one because according to them it will give me same backup of 15min,its a offline UPS btw) Will it cause any problem or should i put another socket and connect it to an inverter? I have connected my pc monitor and Am extension cable where i charge my phone and laptop.