yep. u just need activate/use the visa before its end date and u still get the 90 days, i used to use the o' visa for years to get 90 days per entry .i got a 1 yr multi entry o visa for yrs till they stopped it .
yep. work with the system not against it and you can stay many months .60 free on entry and extend 30 .and if u want stay longer u can leave thailand and re- enter and do same again
from my way of thinking u can use the 90 day visa when u like within the 2 dates on it . . its till 90 days from when u enter thialand . u just need use the visa by 11 dec 2024 .which u will if u are enter thailand in nov 8 2024 .so no problem and no issues .
i use nong khai . there is a bus goes from udon thanni to Vientiane .its easy and cheap. best cross early morning as it gets busy . 35 us dollars for the visa . i aint had to stay over before but seems u do now haha,still it will be fun have a few nights in Vientiane