It's not a recommended practice to daisy chain UPS devices. It can cause both devices not to function properly as well as present with problems caused by ground loops.
Also if one device fails - both become useless.
1 ups eka step up karala dena power eka 230k ma enne ne. eka enne 178- 190 wage. ethakota 2nd ups eka on wenna e ena input eka madi. ekath ups mode wetenwa eka nisa.
sure you can do it but in the middle you have to put an inverter in middle.. but considering energy loss. better buy an DC UPS (for routers) https://eteleshop.slt.lk/product/dcp-mini-ups-0